helo ☆
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Description:
Email tester and debugger
Type: Cask  |  Latest Version: 1.7.0@0  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  formulae.brew.sh
Category: Developer tools
Tags: email testing debugging smtp developer-tools
Install: brew install --cask helo
About:
HELO is a command-line utility designed for testing and debugging email delivery. It allows developers to send test emails to verify SMTP configurations, inspect headers, and validate email rendering without spamming real recipients. The tool simplifies troubleshooting by providing immediate feedback on email server interactions.
Key Features:
  • Send test emails via command line
  • Inspect SMTP transaction details
  • Validate email headers and content
  • Local testing without external dependencies
Use Cases:
  • Debugging SMTP authentication issues
  • Testing email templates in development
  • Verifying email server configuration
Alternatives:
  • mailcatcher – Provides a web interface and SMTP server for local email testing
  • swaks – Feature-rich SMTP transaction tester with extensive protocol options
Version History
Detected Version Rev Change Commit
Aug 5, 2025 2:19pm 1.7.0 0 VERSION_BUMP 88081921
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